lol
ball screws not bearings, sorry still learning.
to be honest with you guys i don't have a clue.
Any recomendation on this (size driver) and what does it do?

this is what's in the kit:
3 axis stepper motor driver3 x ball screws and nuts
3 x stepper motors, pulleys and belts, drive housings
1 x control software licence
3 sets of thrust bearing, & ball bearings

Thanks